Changeable-speed bevel-gearing.



Gnonen :im Ganan'rr, or' ninna,- MICHIGAN.

'y t cHANenAiaLn-'srnnn REVEL-Giannina.

Specication of Letters Patent. Patented ung 11, 1918.

.Application filed December 17,1917. Serial No. 2Q7,562.

To' all 'whom it may concern:

Be it known that I, GEORGE I. GARGETT, a citizen of the United States, residing at .Alma, in the county-of Gratiot and State of Michigan, have invented certain new and useful Improvements vin Changeable-Speed Bevel-Gearing; and I do declare the following to be a full, clear, vand -exact description of theinvention, such as will enable, others skilled in the art to which it appertains to make and use the same. I My invention has for its principal object to provide `a simple and compact variable speed transmission to be employed between the-usual variable speed and reverse gearing of motor vehicles andthe two-part which passes through-the elongated hub 4,

shafts thereof which ldrive the wheels of the machine, the sections of said shafts either carrying two of the wheels or being operatively connected thereto in any preferred manner, by gears chains or the like. -By the provision of the second set of transmis-l sion gears, the operator of the vehicle may take advantage of smooth level stretches and increase the speed of the vehicle without driving the motor above aV predetermined speed. Much better results are thus vobtained than those derived by driving the motor at an excessive speed, since if the vcarbureter :i0v is set for a certain number of revolutions per minute, any speed above this will result in poor'mixing of the air and gas. Furtherfmore, the ignition systemdoes not operate properl when the motor is driven at a speed 85 'above ,t at at which it is intended to travel. "v A further object of the -invention is to so construct the transmission gearing as to -establish substantially'- a direct drive between the motor and the two-part shaft above referred to2 regardless of the adjustment of said caring' for di'erent speeds. 'i

With the foregoing general. objects in view, the invention. resides in the novel features of construction'and unique combinations of Iparts to be hereinafter' fully described and claimed, the descriptive matter beingl supplemented by the accompanying drawings which form a part ofthis specication and in which Figure 1 is a horizontal sectionof the imlproved transmission set for driving at maximum speed; and

' Fig. 2 is a similar view showing therelation of parts when driving at a slower rate 56 0f speed, but with increased power.

`In-the drawings above briefly described,

a shaft whose ends drivethe wheels yof a motor vehicle.

by gears, chains or any `other' preferred means. Said sections 1 yare connected by .dierential gearing 2 including a rotatable housing 3 having a relatively short hollow hub 4 projecting aroundone of. thel sections hollow hub 4 suitably mounted in bearings 5- within the differential casing 6.

I the numerals 1 designate tne'two halves of" The two sections 1 may 'either `carry the rear wheels of the vmachine or may be operatively connected therewith,

Rotatably surroundirigthe'shaft section l is a tubular shaft 7 'having at one end a head 8 adjacent said hub and'provided with external teeth 9. Near its otherl end, shaft 7 is rovided with an'integral bevel gear 10 and eyond this gear the shaft is mounted in a suitable bearing 11. A bushing '132 roytatably surrounds shaft 7 and is secured in an outer tubular shaft-13 whichis rotatably mounted in a suitable bearing 14 secured in a housing 15 which extends from the dif ferential case 6 to an 'additional casing 16 within which the gear 11 is located. One end of the shaft 13 i's formed with a head'17 spaced from thev headl 8 and provided with i meshes with gear 19 and a1 smaller pinion 21 meshes with gear 10, bothof these pinions being carriedV rigidly onv a drive -s'haft 22 suitably mounted and extending at right'.-

angles from the two-part shaft above described. The shaft 22 is driven in any preferred manner. but in most vcases it will re.A

ceive its power from the usualtransmission y 23 which includes variable speed and reverse gearing as well as a clutch, such transmission being suitably operated motor 24. A hollow 'clutch'member 25 is a bodily with but slidable longitudinally of the hub 4 of the di'erential housingf, said member being movable over the heads 8` and 17 and having internal clutch teeth 26 for engagement with the clutch teeth of either of said heads. For shifting member 25 into either operative position or into a neutral position, a .collar 27 is mounted in a pefromy the rotatable I i "'shaft`13 which -is driven .rate of'speed.

ripheral groove 28 in the be'actuated inV any preferred manner,a bell crank 31 and a' control rod 32 being4 shown When clutch member 25 is en aged withl head 18 asfshownin l,` t e tubular 4 by wa differenti I 4"-so that `the two shaftsections *l* areyroof lsaid clutch7member. The

v ,jtated, maximum' speed 'bein obtained-Gby' `this adjustment 'of parts. iW member' 25is shifted so that its'teeth engage the' .teeth 9 "of` l `tubular sha1-'t7 will drive saidy c uteh mem- .ber'and the' latter `will in turn 20.:

withl increased power is-obtained. This is' "the 'normal drive "but: whenever' asmooth en the 'clutch head 8, however the 'inner ferential "housing so' thatdecreased speed stretch is encountered;'f the-joperator' may 'shift intoehighlbyrfmfv'illg Clutch member 25y intoy f engagement.. With' 4`vheal- 'Y 17,.; Increased vehicle speed nay be 'obtainedk without driving .tbe-"motor,v at an excessive tor due to an overwor '-edc'arbureter or ignia tion system Visfthusy prevented so that much transmission may be. in?

stalled as described or in any other pr'e-..v at the discretion of the, manferred manner,

hub of 'said member, said collar having a lateral arm 29l .secured to a sliding shaft which may well i i 1. Ina changeable speed gearing' for motor vehicles, the combination of a two-part shaft for driving the .vehicle Wheels, difrerhousing 3 i's driven by its Ihub ib of said outeiifshat adjacent--saijd diiierem -ti'al housing and a gearon the :other end 'of said Shea, estimer' relatively longftubunr drive the difshaft; adj a'cent said first named clutch 'inemf ll'uteh' member y diii'erentialhilisingand coacting With-the, Impro er runmng of the'moaforesaid clu't' I tubular'sha'fttosaid housingz" a' the scope of the invention` as claimed, nu# merous minor changesma'y fwellbeimade.

I claim: I

'-ential gearing" connecting the two' sections of said shaft and including -a rotatable y the pinion, 20 and gear 19,'. transmits I notionto the hub differential housing, a short outer tubular shaft surrounding one sectionfof saidtwopart shaft in spaced relation thereto, affixed earing in W ich said outer shaft isrotatat bly mountedlla clutch membenonlthe end s haft rpassingrotatably through andproj eeting' "j iz'rom ends of said' outer sha'ft, 'j a .dutch member on the end-"fof said' linner 75 ber and a z'z'e' "bearing '1n-which 'thejothe7 end of'said er shaftji's'rotatablymoun ed, a gear on; said inner "shat,y means' for drivingvthe ars of. the *inner* andfoutergo 'shafts 'at die'fent Y'S'peeds 'andf` a imo'vable .y

'rotatable bodilyfjvvith" said 24111 a @han i e eombinationofa twopart tor vehicles, t

shaft for driving the vehicle Wheels;'diife'rfv .ential gef'irniggI connecting thetwo sctins `of said shaft jan ing, ajpain ofi d includig arotatablehous- ,90

ufacturer, butin all cases itwill beihighlyf spaced relation'yvith said v ousi'ng, f a"`tbu A efficientfor the purposes-intended. .When. lfar 'hub; extending `from ,said.%-hous'ingf to-- .95.

used in connection with the usual tr .ns-misand I prefer in most cases to so employ the invention, but it is to'be understood .that I 55 l i" ploye'd, butfI thatjwithin `amfnot restricted to suchuse. FurthermoreguV 4willbe highly eiiicient andf durable.- Since probablyV the best results the several vspe'ciiic details"v shown and def are obtained from scribed, y'these details 'are `preferably en1- said hub, saidv clutch inemb vhead, means for 4s higlting saidfcliitbh )myhand inthe .presenc of ward'said tubular shaftaezrternallytoothedm s1on,'a greater range of speed is obtained berfor engage -'enttWi tlr'tli'e.teeth-,of ther two subsonb witnesses. 

